Alba posted a pic of her newborn on Instagram on Monday, January 1, writing, “Hayes Alba Warren 12/31/17 Best gift to ring in the New Year!! Cash and I feel so blessed. Haven and Honor are already obsessed with their new baby bro.”

Proud papa Warren also shared a pic that showed him cradling his son. “Hayes Alba Warren: You sure know how to ring in the new year!” he captioned the photo. “You showed up a few days early but we couldn’t be any happier. Your Mamma is the strongest woman I know … you’re so lucky to have her by your side. You have two amazing sisters who already adore you and I know you’ll be thankful to have them guide the way. On your first day of life, I promise to love you, to cherish you, and to provide you with a sandbox full of dreams to explore. Welcome to the family my sweet baby Hayes!”

The 36-year-old Honest Company co-founder announced she was expecting her third bundle of joy via Instagram in July. In the playful Boomerang, Alba cradled her growing baby bump and held a balloon with the number 3 alongside daughters Honor, 9, and Haven, 6.

Later that month, the business mogul was able to squeeze in a little R&R, posting a Boomerang video of her bump while soaking up some sun and fresh air at the beach. She captioned the escape: “#friyay.”

“I go on so many business trips, and they’re usually two or three days. I’ll bring just one at a time and it’ll be like, ‘Mom’s gonna bring you on a special trip,’” she told Us. “We’ll get to have a sleepover, we’ll get to order room service, we’ll get to rent a movie. It’s really fun!”

Alba and Warren, who met on set of 2005’s Fantastic Four, dated for three years before tying the knot in 2008.